install frontend dependencies before the dotnet build

Dockerfile

@@ -5,6 +5,10 @@ WORKDIR /src
 RUN apt-get update && apt-get install -y nodejs npm && rm -rf /var/lib/apt/lists/*
 
 COPY ./src/ .
+
+# Install frontend dependencies before dotnet build
+RUN npm install --prefix ./GreenHome.Web
+
 RUN dotnet restore --verbosity detailed
 RUN dotnet publish  -c Release -o /app